Indicating and positioning system



May' 12, 1942. w. E. DUERINGER I Re. 9

INDICATING AND POSITIONING SYSTEM ri inal Fiied Nov. 9, 1931 3 mentor 8g Walter EDueringer Reissued May T2, 194% INDICATING AND POSITIONING SYSTEM Walter-E. Dueringer, Shaker Heights, Ohio, as-

signor to Bailey Meter Company, a corporation of Delaware Original No. 2,046,676, dated July 7, 1936, Serial No. 573,933, November 9, 1931. Application for reissue March 28, 1938, Serial No. 198,561

39 Claims.

This invention relates to improvements'in positioning systems, and has especial reference to measuring instruments for variables, where an indication, record, or integration of the variable is desirably accomplished remotely, and where such variables may be of a physical, chemical, electrical, hydraulic or other nature. It contemplates remote synchronization of position, wherein the position of a member at one location, may be remotely reproduced. Such position of a member may be determined by the value of a variable to be remotely reproduced for indication, record, integration, use in control, etc. The position to be remotely reproduced may be a measure or indication of fluid level; or a condition such as temperature, pressure, quality or degree; or it may be merely the position of a movable object desirably remotely indicated.

In my invention I provide a system wherein it is possible to locate the indicator, recorder, register or other advising mechanism remotely from a measuring or feeling transmitting mechanism, although not necessarily so remotely. By this means the actuating members whose positions are determined responsive to that which is to be in-' dicated, may be located in juxtaposition to apparatus or location remote from the point at which it is desired to visualize or learn such position representing a measure or indication, and kept in synchronism therewith.

One object of my invention is to provide an improved electrically actuated'remote indicating or positioning system.

Another object is to provide for positioning remotely by means of a self-starting synchronous motor arranged for substantially instantaneous starting and stopping.

A further object is to provide an electrically operated positioning mechanism which may be located remotely at a considerable distance from its actuator.

Still another object is to provide a positioning system wherein an actuator remotely controls the positioning in synchronism with the actuator of a member which may be used for indicating or other purposes. I i

A still further object is to provide a remote recorder and indicator wherein the recording pen and the indicating pointer are positioned through the agency of a self-starting synchronous motor in synchronism with the measuring means or actuator remotely located.

With these and further objects in view, which will become apparent, I will now describe the drawing in which the one figure represents somewhat diagrammatically a preferred embodiment of the invention.

A variable such as the rate of flow of a fluid through a conduit I is desirably integrated with respect to time to give a total quantity of the fluid passing a given point during a specified interval of time such as the interval between two readings of a register. I show positioned within the conduit 1 a flow nozzle 2 forming a restriction to flow through the conduit and for creating thereby a pressure differential across the flow nozzle bearing a known relation tothe rate of fluid flow therethrough. From the conduit l at opposite sides of the flow nozzle 2 I lead the pressure pipes 3 and 4 to a rate of flow meter indicated in general at 5.

Such a rate of flow meter may be of the liquid sealed bell type as disclosed in the patent to LedouX, Number 1,064,748, granted June 17, 1913, wherein the bell is shaped and has walls of material thickness, to the end that the positioning of the bell is in direct proportion tothe rate of fluid flow, thereby correcting for the quadratic relation which exists between rate of fluid flow through such a flow nozzle and difierential pressure resulting therefrom. The bell is shown at 6 diagrammatically in dotted lines, and may be sealed by a liquid such as mercury whose approximate level within and without the bell is indicated.

The pressure within the conduit l ahead of the flow nozzle 2 is eifective through the pipe 3 upon the interior of the bell 6, while pressure at the outlet of the flow nozzle 2 is effective through the pipe 4 upon the exterior of the bell 6, to the end that the bell is positioned vertically by the pressure differential across the flow nozzle and in linear relation to the rate of flow of the fluid.

Such vertical positioning of the bell results in an angular positioning, about a fixed fulcrum point I, of an arm 8 for transmitting motion from the bell to the shaft of the fulcrum l for the positioning of an arm 9 whose function will be explained hereinafter and for positioning an indicating pen and pointer Ill cooperating with an index l I. The pen I0 is further adapted to record over a circular chart l2 which is desirably driven uniformly at a constant speed by a motor l3, illustrated as an electric motor, and drives the chart l2 through the agency of a shaft I4 and gearing l5.

In the embodiment illustrated I provide in connection with the flow meter 5, a register [6 desirably remotely located from the flow meter and having graduated dials with pointers moving in conjunction therewith for affording a continuously available means of reading the accumulated total of the rate of flow of fluid through the conduit I Such total flow for any desired time interval may be obtained by subtracting the reading of the dials of the register l6 at the beginning of the interval from the reading of the dials at the endof the interval, the difference between such readings representing the total flow between the beginning and the end of the interval of time, the arrangement being such that the total is the integration of the rate of flow of 'fiuid with respect to time.

For driving the register l6 which in itselfcontains the necessary gear reduction between dials, I provide a self-starting single-phase synchronous motor l'l substantially independent of voltage changes and whose speed is 'directlyand solely dependent upon the frequency of the alternating current supplied thereto.

The motor [1 has a rotor 18 comprising inherent speed reducing gears and adapted to cooperate with and drive the internal gearing of the register l6 when rotating.

As illustrated, themotor H has a field winding IQ for effecting rotation of the rotor l8 when energized.

The field I 9 has one connection directly to the Power line 22, while a second connectionis made through a conductor 23, a contact 24 and a con-v ductor 25 to the power line 2|.

With the winding l9 energized a torque is developed thereby on the rotor [8 for rotation thereof in desired direction and. corresponding actuation of the register IS in a direction to increase the readings of the dials thereon. When the circuit is open to the winding l9 through the opening of contact 24, then the rotor l8 and the register [6 remain stationary.

The arrangement described is such that the rotation of the pointers relative to the dials of the register I6 is in direct relation to the time of rotation of the rotor 18 and correspondingly to the time during which the field coil I9 is energized.

I further provide in connection with the flow meter 5 a recording and/or indicating device 26 desirably remotely located from the flow-meter 5 and from the register 16. As illustrated, an indicator arm 21 comprises a pointer cooperatingv with an index 28 and a pen for recording upon a circular chart 2!! driven at uniform speed through the agency of a self-starting synchronous motor 30 and the gearing 3|.

I cause an angular positioning of the indicator arm 21 around a fixed fulcrum shaft 32 by a synchronous electric motor 33 and having two field coils 34, 35 for causing rotation of a rotor 36 and corresponding angular movement of the pointer 21 in one direction or the other.

One terminal of the field 35 joins the conductor 23 leading to the contact 24 while the other terminal joinsthe power line 22 through a conductor 31. The field 34 has one terminal connected to the conductor 31 and the other terminal leads through a contact 38 and conductor 39 to the power line 2|. It will be seen, then, that energization of the field winding 34 is controlled by the contact 38, while that of the field winding 35 is controlled by the contact 24.

When both the contacts 24 and 38 are opencircuited, the fields 34 and 35are de-energized and norotation of the rotor 36occurs; Likewise, when both the contacts'24 and 38 are close-circuited, bothzof the field windings and 35 are:

energized and the resulting equal opposing torque results in stationary positioning of the rotor 36 and of the indicator 21. If, however, the contact 24 is close-circuited, while the contact 38 is opencircuited, or vice versa, rotation of the rotor 36 will occur in one direction or the other through the energizationof the field winding 34 or the field winding 35, with corresponding lack of application to the rotor of the equal opposing torque of the field winding which is at that time notenergized. Such rotation of the rotor 36 in one direction or the other will result in a positioning, through the inherent gear reduction of the rotor 36, of'the'indicator 21 relative to the index 28'andthe recording chart 29. It will therefore be apparentthat I may cause a change inthereading on the index 28 or on the recording chart 2!! of the indicator pointer 21 through the relative openor close-circuiting of the contacts 24'and'38.

I have provided a register NS for indicating the summation or integration of variables as well as a device 26 for indicating-and/ or recording the instantaneous value of variables, each or both operated by electrically actuated means and which may be remotely positioned from each other and from the actuator, the interconnection therebetween comprising electric conductors. At the point which I term the actuating point,

L namely the meter 5, I provide a means for making and breaking circuit to the field IQ of the register I6 and to the field 35 of the device 25, arranged so that the length of time during which the circuit is made is. representative of the 1 amount of actuation I desire to impart to the stant of initiating the increment, nevertheless the increment length is continuously modified throughout its duration in accordance with any change in the value of the variable throughout the duration of the increment.

Certain features of the actuator mechanism are disclosed and claimedin the patent to Harvard H. Gorrie for Integrating mechanisms, Number 1,892,183, granted December 27, 1932; while certain features of the actuator and of the remotely actuated integrator are disclosed and claimed in the patent to Rew E. Woolley for Integrating mechanisms, Number 1,892,184, granted December 27, 1932, both having the same assignee as the present application.

At: the fluid meter 5 and in connection with the same Iprovide as an actuator or transmitting element, a circuit closing arrangement of which the contact;'24 controls energization of the field windings Hand 35 in parallel. One of the contacts 24 is carried by a pivoted weighted arm lug) is such that when there is 'zero fluid flow through the conduit l, the bell 6 will be in its lowermost position and the righthand end of the member 40 in its uppermost position of travel. Conversely, when fluid flow through the conduit 1 is at 100% of capacity, the bell 6 will be in its uppermost travel position and the righthand end of the member 40 in its lowermost travel position. The righthand end of the member 40 thus traverses a predetermined path in a single plane in space.

The opposite end of the member 48 carries a roller 42 which by gravity bears against the surface of a cam 43 in a manner such that it is continually reciprocated, at a substantially uniform speed, between definite limits of travel, through rotation of the cam 43 driven at a uniform speed by the motor 13. The chart 12, for example, may be arranged to make one revolution in 24 hours, while the speed of the cam 43 might be in the nature of one revolution in 10 seconds. It will be seen, then, that the member 40 is arranged for positioning along a definite path within limits of travel in a single plane in space, such that movement of. the member is angularly about either end by the positioning of the opposite end between definite limits of travel. The contact point carried by the member 48 is then positioned along a definite path in dependence upon the rate of fluid flow and upon a definite time reciprocation.

In the illustration, the roller 42 is at its uppermost travel limit, whereas the rate of fluid flow is indicated at approximately 50% of travel. When the rate of flow is zero and the righthand end of the member 40 at its uppermost position, then the reciprocation of the contact carried by the member 40, through reciprocation of the roller 42, will not cause closure of the contacts 24. However, when rate of fluid flow is maximum and the righthand end of the member 48 is at its lowermost position, then time reciprocation of the roller 42 causes closure of the contacts 24 throughout the entire or major portion of the reciprocation and consequent maximum actuation of the register [6, integrating. the maximum fluid flow for which the system is designed.

Simultaneously, the maximum engagement of the contacts 24, for each time period representative of maximum rate of fluid flow will cause a maximum time energization of the fleld 35 for rotation of the rotor 36 in a direction tending to move the pointer 21 upward relative to the index 28 and outward relative to the chart 29 to indicate on the index and chart the maximum rate of fluid flow through the conduit.

correspondingly, different percentages of maximum rate of fluid flow will cause integration on the register I6 at a uniform rate, but for a percentage of each predetermined time interval, depending upon the percentage of maximum rate of flow; and simultaneously, an energization of the field winding 35 for percentages of each predetermined time interval depending upon the rate of fluid flow.

It will be seen that, were the field winding 35 only effective upon the rotor 36, the movement of the indicator 21 would always be in the same direction, which would cause it very shortly to reach a maximum position of travel. I therefore provide the field winding 34 adapted for causing the rotor 36 to move in the opposite direction so that the indicator 21 may be moved in either direction and find a position corresponding to the position or the indicator arm in with which it is desirably to be synchronized.

I have duplicated in the device 26, the freely floating member 40 of the flow meter 5 as indicated at 48A. I indicate at A a rod connect-' ing the righthand end of the member 411A with an arm 9A positioned by the rotor 36 simultaneously with. the indicator 21. Thus the righthand end of the freely floating member 40A is positioned between definite limits of travel along a predetermined path in a single plane of space, the limits of travel corresponding to maximum and minimum position of the indicator 21. The lefthand end of the floating member 48A is reciprocated by a roller 42A carried by and on a cam 43A which is continuously rotated at a uniform speed by the motor 30.

The contact 38, as previously mentioned, is inserted between the conductor 39 and the field Winding 34 to control the energization of same, and is adapted to be openor close-circuited through reciprocation or position of the floating member 48A, The arrangement described is similar to, or duplicates, that of the meter 5 and is such that if the indicator l0 and the indicator 21 are in synchronism and the two cams 43 and 43A are in synchronism, then the contacts 24 and 38 will be simultaneously closed and opened throughout varying percentages of the time cycle of the cam, depending upon the value of the variable, in this case rate of fluid flow, which inaddition to time is positioning the floating members 48 and 48A. If however, and still assuming that the cams 43 and 43A remain in synchronism, the righthand end of the member 40 is positioned to a different position than the righthand end of the member 48A, then either the field winding 34 or will be energized alone for a portion of each time period, and cause a movement of the indicator 21 comprising a follow-up movement of the contact 38.

It will be seen in operation that if the rate of fluid flow through the conduit I increases, then the righthand end of the member will be lowered an amount proportional to the increased rate of flow and correspondingly the contact 24 the indicators l8 and 21.

willbe close-circuited for a longer percentage of the time period of revolution of the cam 43 than is the contact 38 for the same time period of rotation of the cam 43A, so that the field winding 35 will be energized alone for a time increment of the difference between the time of engagement of the contact 24 and that of the contact 38, whereby the pointer 21 will be moved upwardly on the chart 29 anamount proportional to such difference in time. Such movement of the indicator 21 will cause a change in the position of the righthand end of the floating member 48A and depending upon the magnitude of the change in the rate of fluid flow, then either in a single or in several revolutions of the time cams 43 and 43A, will be. accomplished a synchronizing of .the members 48 and MA as well as This will be understood, for in the example given, if the time of closure of the contact 24 is greater than that of the contact 38, whereby the field winding 35 is energized to cause an upward movement of the indicator 21, such upward movement will cause a downward movement of the righthand end of the member 48A whereby upon the next revolution of the cams 43, 43A, the contact 38 will be close-circuited for a greater length of time thanpreviously, and such adjustment of the time closurecfthe contact will continue until itis equal to the time-closure oi the contact 24.

If in operation the rate of flow of fluid decreases from that previously, then correspondingly the time of closure of the contacts 24 will be less than before, and thedifference between the time of closure of the contact 24 and that of the contact 38 will be in the direction favoring the contact 38 to the extentthat the contact 38.

will have been closeda small time incrementtbeyond that equal to the time of closure of the contact 24, whereby the field winding 34-will be energized alone for a short increment of time to cause movement of the pointer 21 downwardly and correspondingly of the righthand end of the member 40A upwardly until again the. contacts 24 and 38 are closed for equal time lengths.

With the mechanism and system so far described, the register I6 accomplishes a summation or integration with respect to time of the rate of fluid flow indicated and recorded on the meter 5, while the remote measuring device 26 causes an indication and/or recording wherein the pointer 21 is moved in synchronism with the pointer in of the transmitting actuator 5. Such synchronization, between the position of the indicator 21 and the indicator III is based primarily, of course, upon proper relative design of dimensions, speed, gear ratios, etc., as well as upon'the keeping in synchronism of the motors l3 and 30. Although I have shown the motors l3 and 36 as connected across the same source of alternating current power 2|, 22, wherein the similar motors will operate in synchronism as will the cams 43 and 43A, I further provide means for checking such synchronism, and if for some reason such as the momentary or prolonged stoppage of power to one of the motors, for example the motor 36, I correct for such lack of movement of the motor 39 as may have been caused by such a failure of power, to result in a resynchronizing of the cams 43, 43A.

The motor I3 is connected directly to the power lines 2 I, 22. One terminal of the field winding 44 of the motor 30 is connected through the conductor 39 to the power line 2|, whereas theother terminal is connected in parallel through a conductor 45 to a normally close circuited contact 46 and a normally open circuited contact 41. By normally so, I mean that when normal operation occurs, with the motors l3 and 30 in synchronism, the contact 46 will be close-circuited, while the contact 41 will be open-circuited, and vice versa. The opening and closing of the said contacts 46, 41 is controlled by cams 46, 49 respectively, driven at a uniform speed by the motors 30, I3, simultaneously with the cams 43A, 43.

One of the contacts 46 is spring urged normally against a stop providing an upper limit of travel. The mating contact 46 comprises an arm 56,

spring urged to mate with the first-named con tact, pivoted at one end and carrying at its oppo site end a nose adapted to ride on and engage the cam 48, the arrangement being such'that the contacts 46 are close-circuited, except during a portion .of the revolution of the cam 48 through which ahigh partof the cam..acting upon the nose of the arm 50 moves the contact carried thereby away from its mating contact to opencircuit position.

The arrangement of the contacts 41 is similar, both contacts being springurged separately; and

in directions such that they. are close-circuited only during that part of: the .rotationof thelcam' 49 corresponding to the open-ch suited position of. the contacts 46; The arrangementof both sets of contacts is-suoh that when the motors l3 and 3D are.in synchronism, then for a portion of the revolution of the two motors, the contact 46 is closed while the contact 41 is opened, and vice versa.

It will be seen that with such arrangement and normally so, the motor 30 is in continual rotation, for during one-half of the cycle of rotation of the cam 48 the contact 46 is closed, thus energizing the field winding 44, while during the alternate half revolution of the cam 48, the cam 49 of themotor I3 causes a closure of the contact 41 energizing thefield winding 44 in parallel with the contact 46 whichis. at that time open-circuited, thus resulting in a continual rotation of the motor 36.

If, however, the power ,line to the motor 36 is momentarily de-energized, causing the motor to stop, then when power is again available at the motor 36, the staggering by half-cycles of the cam 48 and the cam 49 will not be exact, as previously, and rotation of themotor 33 will pause for a short interval during each cycle of rotation of the'cam 49, until it again gets in step with the motor l3. The number of revolutions of the cam 49 which will occur before this resynchronizing is accomplished depends upon how far out of synchronism the cams 48 and 49 are at the time power is again made available for the field winding 44.

While I have illustrated and described a pre ferred embodiment of my invention in connection with the remote positioning or indicating of the flow of a fluid, the invention is by no means limited thereto, and may be used for remote synchronizing of position or indication of any variable or constant desirably remotely kept in step with a sender or actuator in itself representing a position.

It is not necessary that the exact mechanical and electrical arrangement shown be carried out, for I contemplate broadly a system whereby I may remotelyindicate, record, integrate or otherwise showor advise an observer at a remote point the position of' a member-actuated in any desired manner.

Idesire it to be understood that I am not to be limited by the embodiment shown, but only as to the claims iniview of prior'art.

What .I' claim as new and .desire to secure by Letters. Patent of the-United States, is:

1., A positioning system comprising in combination, an electric circuit; a motor in said circuit having'two similar and opposed windings, whereby when either winding is energized, the motorrotates in a given direction, and when both windings are energized, the motor is not urged to rotation; a first member; a time actuated element for continually moving said first member; anelement responsive to the value of a variable for. variably moving said first member; means operatively' connecting said first member with the time actuated element and with the element responsive to the value of a variable, whereby the first member is jointly positioned by said two elements; means actuated by said first member to open the circuit to the first of said windings to permit the second then energized winding to rotate the motor inone direction; a second member; a second time actuated element for continually lmovingsaid second member; means connecting said' second member with'the second time actuated element and with'the motor, whereby the second memberis jointly positioned by said second time actuatedelement and by s'aidmotor; and means actuated by said second member to open the circuit to the second of said windings to permit the then energized first winding to rotate the motor in the opposite direction.

2. A positioning system comprising in combination an electric circuit; a motor in said circuit having two similar and opposed windings, whereby when'either winding alone is energized the motor rotates in a given direction, and when both windings are energized, the motor is not urged to rotation; a first member; a time actuated element for continually moving said first member; an element responsive to the value of a variable for variably moving said first member; means operatively connecting said first member with the time actuated element and with the element responsive'to the value of a variable, whereby the first member is jointly positioned by said two elements; a normally closed contact in the circuit to the first winding moved to open circuit position by said first member, to permit the second then energized winding to rotate the motor in one direction; a second member; a second time actuated element for continually moving said second member; means connecting said second member with the time actuated element and with the motor, whereby the second member is jointly positioned by said second time actuated element and by said motor; and a normally closed contact in the circuit to the second winding moved to open circuit position by said second member, to permit the first then energized winding to rotate the motor in the opposite direction.

3. A positioning system comprising in combination, an electric circuit; a first motor in said circuit; a second motor in said circuit; means responsive to the value of a variable; a first member; means operatively connecting said first member with the secondv motor for continually moving said first member and with the means responsive to the value of a variable for variably moving said first member, whereby the first member is jointly positioned by said second motor and by said means responsive to the value of the variable, the first member controlling the electric circuit to said first motor; a third motor in said circuit; a second member; and means connecting said second member with the third motor for continually moving said second member and with the first motor, whereby the second member is jointly positioned by the third motor and by the first motor, the second member controlling vthe electric circuit to said first motor.

4, A positioning system comprising in combination an electric circuit; a first motor in said circuit, having two similar and opposed windings, whereby when either winding is energized, the motor rotates in a given direction, and when both windings are energized, the motor is not urged to rotation; a second motor in said circuit; means responsive to the value of a variable; a first member; means operatively connecting said first member with the second motor for continually moving said first member and with the means responsive to the value of a variable for variably moving said first member, whereby the, first member is jointly positioned by said second motor and by said means responsive to the value of the variable; means actuated by said first member to open the circuit to the first of said windings to permit the second then energized win ing to r t t t e first motor in one direction; a thirdmotor in said circuit; a second member; means connecting said second member with the third motor for continually moving said second member and with the first motor, whereby the second member is jointly positioned bythe third motor and by the first motor; and means actuated by said second member to open the circuit to the second of said windings to permit the then energized first winding to rotate the first motor in the opposite direction.

5. A positioning system comprising in combination an electric circuit; a first motor in said circuit, having two similar and opposed windings, whereby when either winding alone is energized, the motor rotates in a, given direction, and when both windings are energized, the motor is not urged to rotation; a second motor in said circuit; means responsive to the value of a variable; a first member; means operatively connecting said first member with the second motor for continually moving said first member and with the means responsive to'the value of a variable for variably moving said first member, whereby the first member is jointly positioned by said second motor and by said means responsive to the value of the variable; a normally closed contact in the circuit to the first winding moved to open circuit position by said first member to permit the second then energized winding to rotate the first motor in one direction; a third motor in said circuit; a second member; means connecting said second member with the third motor for continually moving said second member and with the first-motor, whereby the second member is positioned jointly by the third motor and by the first motor; and a normally closed contact in the circuit to the secondwinding, moved to open circuit position by said second member, to permit the first then energized winding to rotate the motor in the opposite-direction.

, 6. A positioning system comprising in combination an electric circuit; a first motor in said circuit; a second motor in said circuit; means responsive to the value of a variable; a first member; means operatively connecting said first member with the second motor for continually moving said first member and with the means responsive to the value of a variable for variably moving said first member, whereby the first member is jointly positioned by said second motor and by said means responsive to the value of the variable, the first member controlling the electric circuit to said first motor; a third motor in said circuit; a second member; means connecting said second member with the third motor for continually moving said second member and with the first motor, whereby the second member is jointly positioned by the third motor and by the first motor, the second member controlling the electric circuit to said first motor; a cam .driven by the second motor; a contact actuated by said cam to close the circuit to the third motor during one-half of the cycle of rotation of said cam and to open the circuit to said third motor during the alternate one-half cycle of rotation; a cam driven by the third motor; a contact actuated by said last mentioned cam to close the circuit to the third motor during one-half of the cycle of rotation of said cam and to open the circuit to the third motor during the alternate onehalf cycle of rotation, the cams and contacts being so arranged that the third motor continually rotates when the second and third motors are synchronized, but when said motors are not synchronized, s id cams and contacts effect ng a pause in the rotations! said'third-motor. until said third motor again becomesasynchronized with said second motor.

7. Mechanism for remotely indicating the value of avariable, comprising in combination an electric circuit; a first motor in said circuit; a second motor in said circuit; means responsive to the value of a variable; a first indicator; means connecting said indicator with the means responsive to the value of the variable; a'first member; means operatively connecting said first member with the second motor for continually moving said first member and with the means responsive to the value of the variable for variably moving said first member, whereby the first member is jointly positioned by said second motor and by said means responsive to the'value of the variable, the first membercontrolling the electric circuit to said first motor; a third motor in said circuit; a second member; means connecting said second member with'the third motor for continually moving said second member and with the first motor, whereby the secondmember is jointly positioned by the thirdmotorandbytm first motor, the second member controlling the electric circuit to said first motor; a second indicator; and means connectingsaidj second indicator with the first motor for actuation thereby.

8. A positioning system comprising in combi-- nation, an electric circuit; a motor in said circuit; a first member; a time actuated element for continually moving said first member; an element responsive to the value of a-variablefor variably moving said first member; means operatively connecting said first member with the time actuated element and with the element responsive to the value of a variable, whereby the first member is jointly positioned by'said two elementsthe first member controlling the electric circuit to said motor; a second member; a second time actuated element for continually moving'said second member; and means connecting said second member with the second time actuated element and with the motor, whereby the second memher is jointly positioned by said secondtime'actuated element and by said motor.

9. A positioning system comprising in combination, an electric circuit; a motor in said circuit; a first member; an element responsive to an independent variable for continually moving said firstmember; an element responsive to the value of a variable for variably movingsaidfirst member; means operatively connecting said first member with the element responsive to an independent variable and with the element responsiveto the value of a variable, whereby the first member is jointly positioned by said two elements,the first member controlling the electric circuit to said motor; a second member; a second element responsive toan independent'variable for continually moving said second member; and means connecting said second member'with the second element responsive to an independent variable and with the motor, whereby'the second member isjointly positioned by said second element responsive to an independent variable and by said motor.

10. A positioning system comprising in combination, anelectric circuit; a first electro-magnetic device in said circuit; a second electromagnetic device in said circuit; means responsive to the value of a variable; a first member,

means operatively connecting said first member with the second electro-magnetic device for conmeans responsive to the value or a variable for variablymoving said first member, whereby the firstmember is jointlypositionedby said second electro-magnetic device and by said means responsive to thevalue of the variable, the first member controlling the electric circuit to said first electro-magnetic device; a third electromagnetic device in said circuit; a second member; and means connecting said second member with the third electromagnetic device for continually moving said second member and with the first electro-magnetic device, whereby the second member is jointly positioned by the third electromagnetic device and by the first electro-magnetic device, the second member controlling the electric circuit to said first electro-magnetic device.

11. In a telemetric system, a first transmitting means for periodically telemetering electric impulse signals of a duration corresponding with a first variable, a second transmitting means for periodically and at least partially simultaneously with said first named transmitting means telemetering electric impulse signals of a duration corresponding to a second variable, and receiver means under the joint control of said signals.

12. In a telemetric system, a plurality of transmitting means, each of said means adapted to periodically originateelectric impulse signals of a time duration corresponding to the magnitude of a variable, and receiver means jointly responsive to the signals from said transmitting means movable in each cycle of operation .an amount corresponding to the difference in time duration of the signals originated by said transmitting means.

13. In atelemetric system, a first transmitting means for periodically telemetering electric impulsesignals ofLa time duration corresponding to .ajfirst variable, asecondtransmitting means for at least partially simultaneously periodically telemetering electric impulse signals of a time duration corresponding to a second variable, and receiving means comprising an electro-responsive device having opposed windings under the joint control of said signals; one of said windings being energized for the time duration of the signals from said first named transmitting means and the other of said windings .being energized for the time duration of the signals from the second named transmitting means.

14. In a telemetric system, an electromagnetic device having opposed windings and a member urged to movement when either of said windings alone is energized, a first transmitting mean for periodically energizing one of said windings for a variable portion of each period, and a second transmitting means for periodically and at least partially simultaneously with said first named transmitting means energizing the other of said windings for a variable portion of each period, so that said member is urged to movement for an increment of time in each period of operation proportionalto the difference in time duration of the energization of said windings.

15. A positioning system comprising in combination. a motor having two similar and opposed windings whereby when either winding alone is energized the motor rotates in given direction, and when both windings are energized the motor is not urged to rotation; a first transmitting means for periodically energizing one of said windings for a time. increment corresponding to a first variable, and a second transmitting means for at least, partially simultaneously periodically energizing the other of said windings for a time increment corresponding to a second variable, to periodically urge said motor to rotation for an increment of time corresponding to the difference in the time duration of the energization of said opposed windings.

16. In a telemetric system, a first transmitting means for periodically telemetering electric impulse signals of a time duration corresponding with the magnitude of a first variable, a second transmitting means for periodically telemetering electric impulse signals of a time duration corresponding with the magnitude of the second variable, receiver means having a first winding responsive to the signals from said first transmitting means and a second Winding responsive to the signals from said second transmitting means, and a member in said receiver means urged to movement in one direction while said first winding alone is energized and to movement in opposite direction when said second winding alone is energized, whereby the net movement of said member during each period of operation is proportional to the difference in time duration of the energization of said windings.

17. In a system for telemetrically positioning a member in correspondence with changes in the magnitude of a variable, the combination of means for cyclically establishing electric impulses of a time duration corresponding to the magnitude of the variable, means for cyclically establishing electric impulses of a time duration corresponding to the position of said member; and means jointly responsive to said impulses for positioning said member in accordance with the difierence in time lengths of said impulses.

18. In a telemetric system, a first transmitting one of said variables in accordance with the difference in time duration of said first and second named signals.

19. In a telemetric system, a first transmitting mean for periodically telemetering electric impulse signals of a time duration corresponding with a first variable, a second transmitting means for at least partially simultaneously periodically telemetering electric impulse signals of a time duration corresponding with a second variable, receiver means jointly responsive to said signals,

and means under the control of said receiver means adapted to alter the magnitude of the second variable so as to bring the signals corresponding therewith into equal time duration with those corresponding with the first variable.

20. In a telemetric system, transmitting means for periodically telemetering electric impulse signals of a time duration corresponding with an independent variable, a second transmitting means for periodically telemetering electric impulse signals of a variable time duration, and means comprising a reversible motor movable an amount proportional to the difference in time duration of said first and second named signals for varying the time duration of said last named signals to make them equal in time duration to said first named signals.

21. In a system for maintaining a predetermined ratio between two variables cyclically telemetered by electric impulse signals of duration corresponding therewith, the combination of telemetric receiver means having 'a portion responsive to each 'of said signals, said receiver means including differential means responsive to the difference between receiver means signal responses, and means for controlling one of said variables actuatable by said receiving differential means to maintain the signals corresponding to said last named variable equal in time duration to those corresponding to the other of said variables.

22. In a telemetric system, a first transmitting means for periodically creating signals of a duration corresponding with a first variable, a second transmitting means for periodically creating sig nals of a duration corresponding with a second variable, receiver means under the joint control of said signals, and circuit controlling means under the control of both said transmitting means for automatically maintainingsaid transmitting means in synchronism.

23. In a telemetric system, a plurality of transmitting means each adapted to periodically propagate electric impulses of a time duration proportional to the magnitude of a variable, means for varying the speed of one of said transmitting means under the joint control of said transmitting means whereby the impulse of shortest time duration occursduring the increment in each cycle of operation when the impulse of longest duration is being propagated.

24. In a system for maintaining a predetermined ratio between two quantities cyclically telemetered by signals of durations corresponding therewith, the combination of telemetric receiver means for each quantity each having a portion responsive to its respective signal duration, said receiver means including difierential means cyclically responsive to the difierence between said receiver means signal responses, and means for controlling one of said quantities actuatable by said receiving difierential means.

25. In a telemetric controller, transmitting means for cyclically telemetering signals of a duration corresponding with a master quantity, a second transmitting means for cyclically telemetering signals of a duration corresponding with a variable quantity, and means jointly responsive to said signals from both said transmitting means and adapted to alter said variable quantity so as to bring said signals into equality.

26. In a telemetric controller, transmitting means for cyclically telemetering signals of a duration corresponding with a master quantity, a second transmitting means for cyclically telemetering signals of a duration corresponding with a variable quantity, and means jointly controlled by said signals from both said transmitting means for bringing the value of said variable quantity into a predetermined relation with that of said master quantity.

27. In a telemetric controller, transmitting means for cyclically telemetering signals of a duration corresponding with a master quantity, a second transmitting means for cyclically and simultaneously telemetering signals of a duration corresponding with a variable quantity, and means jointly responsive to said signals from both said transmitting means and adapted to alter the value of said variable quantity to bring said value into correspondence with that of said master quantity.

28. In a telemetric controller, transmitting means for cyclically telemetering signals of a duration corresponding with a master quantity,

a second. transmitting; means. for'cyclically telemetering signals of'a' duration corresponding with a variable quantity, andmeans comprising'a. re-

versible motor jointly controlled by'said signals from both said transmitting means for altering said variable quantity to bring the value thereof into a predetermined relation'with that of said master quantity.

29. In a telemetric controller, transmitting means for cyclically telemetering signals of a duration corresponding with a master quantity, a second transmitting means for cyclically telemetering signals of a duration corresponding with a variable quantity, and means comprising. a reversible motor jointly controlled by said signals from both said transmitting means for altering said variable quantity to bring the duration of said signals into equality.

36. In a telemetric apparatus, a transmitter for cyclically creating signals of a duration corresponding with a master. quantity, a second transmitter for cyclically creating signals of a duration corresponding with a variable quantity, means jointly controlled by said signals for bringing said variable quantity into predetermined relation with said master quantity, andmeans for automatically restoring synchronism between said transmitters upon loss of synchronism.

31. In a telemetric controller, a master transmitter adapted to cyclically set up impulses of a duration corresponding with a predetermined controlled quantity, means for affecting said quantity and displaceable through an extent corresponding therewith, transmitter means ior said displacement, and motor means for positioning said quantity-affecting means operatively connected to eachof said transmitters and adapted to so move said .quantity-afiecting means as to bring the durations of said impulses into equality.

32. In apparatus for telemetrically controlling a dependent quantity in relation with a master quantity; transmitting means for each quantity, each including means movable at constant speed and constrained to move in a predetermined path, means positionable relative to said movable means in correspondence with its said respective quantity, and contactor means jointly controlled by the coaction of said movable means with said positionable means to cyclically create a signal of a duration corresponding with its said respective quantity; and means jointly controlled by said signals to bring the value ofsaid dependent quantity into a predetermined relation with that of said master quantity.

33. Telemetric control apparatus, as in claim 32, in which said movable means and said positionable means of one of said transmitting means are kinetically similar to the corresponding means of the other.

34. In a system for maintaining two cyclically telemetered quantities in a predetermined proportion, the combination of means for cyclically telemetering each of said quantities to a receiver,

meansfor controllingone'of said quantities and telemetric: receiver means cyclically responsive to each of said quantities connected to said controlling means and adapted to actuate said controlling means when said predetermined proportion is departed from.

35.In a system for maintaining a predetermined ratio between two quantities cyclically telemetered by signals of a time-function corresponding respectively therewith, the combination of telemetric receiver means respectively responsive to said cyclical signals and means conjointly actuatable thereby for controlling one of said quantities.

36. In a telemetric proportioning system, the combination of means to cyclically telemeter one quantity, means to telemeter a second quantity, and means conjointly governed by said telem etering means for controlling one of said quantities to maintain the first of said cyclically telemetered *quantities in a predetermined propor tion to the second.

3'7. In a system for telemetrically positioning a second member in correspondence with the position of and changes in the position of a first member, the combination of means for cyclically establishing electric impulses of a time duration corresponding to the position of the first member, means for cyclically establishing electric impulses of a time duration corresponding to the position of the second member; and means jointly responsive to said impulses for positioning said second member in accordance with the differencein time lengths of 'said electric impulses.

38. In a system for maintaining a predetermined ratio between two variable physical quantitles or conditions cyclically telemeteredby elec tric impulse signals of durations corresponding therewith, the combination or telemetric receiver means having'a portion responsive to each of said signals, said receiver means including differential means cyclically responsive to the difference between said receiver means signal responses, and means for controlling one of said conditions actuatable by said-receiving dilTerential means upon a departure of said one ccndition from a given value of the other of said conditions for maintaining said one condition substantially at said given value.

39. In a telemetric controller, transmitting means for cyclically telemetering electric impulse signals of a duration corresponding with values of a master independent variable, a second transmitting means for cyclically telemetering electric impulse signals of a duration corresponding with values of a variable physical condition subject to change with time, and means jointly controlled by said signals from both said transmitting means for maintaining said variable physical condition substantially at a given value of said master variable.

WALTER E. DUERINGER. 

